Indefinite is a bad idea as it reduces the security of the OWA application.
You can adjust the time out using the OWA Admin tool, which is a free download from Microsoft. Install the tool on a WORKSTATION, not your Exchange server.

Simon.

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rsleemAuthor Commented: 2006-11-17

I got the tool and install and configure it. Which one of those settings are the one to modify that particular setting?